Torsten Förtsch wrote: > Now, I have a database with very low write activity. Archive_command is called about once per hour to > archive one segment. When the database was moved to PG 9.5, it was initially configured with insanely > high settings for max_wal_size, min_wal_size and wal_keep_segments. I reset min/max_wal_size to the > default settings of 80MB and 1GB and reduced wal_keep_segments to 150. > > Why does a database that generates a little more than 1 WAL file per hour and has a checkpoint_timeout > of 30 minutes with a completion_target=0.7 need so many of them? The default value for min_wal_size is > 80MB which amounts to 5 segments. That should be totally enough for this database. > > Is this because of the previously insanely high setting (min=1GB, max=9GB)? Should I expect this value > to drop in a week's time? Or is there anything that I am not aware of? The size of pg_xlog will shrink slowly if there is little activity on the database. Whenever a WAL segment has been archived, it will be deleted rather than recycled as long as WAL size exceeds max_wal_size. Yours, Laurenz Albe -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
